Radius-angle former



March 1, 1949. SNEVA RADIUS-ANGLE FORMER Filed. Jan. 50, 1946 INVENTOR. [N60LF 5N6 1 use of stop blocks or pins.

this invention there is a minimum of wear, the

Patented Mar. 1, 1949 RADIUS-ANGLE FORMER Ingolf Sneva, Bedford, Ind, assignor to W. F.

Meyers Company, Bedford, Ind, a corporation Application January 30, 1946, Serial No. 644,263

11 Claims.

This invention relates to an apparatus for dressing grinding wheels through the usual application thereto of a diamond dressing tool, as well as the forming of tools by precise grinding when applied to a plain surface grinding wheel, reference being had to my Letters Patent No. 3, granted March 2, 1948, entitled Radiusangle tool former.

More particularly, the former herein disclosed is adapted on the one hand to support a diamond dressing tool and so apply it to the dressing of a grinding wheel as to dress said wheel to any desired angle, radius of curvature or angle tangent to a prescribed radius to curvature. On the other hand, a tool to be formed may be substituted on this former in place of the diamond dressing tool, and similarly applied thereby to a grinding Wheel for grinding any prescribed angle, radius of curvature or angle tangent to radius as may be desired.

The principal object of this invention is to provide an accurate and convenient locating device for determining the location of the tool in relation to the line intersecting the axis of rotation of the former without the use of manually positioned or operable stop devices. This is accomplished by provision of a suitable camming device mounted upon one of the compound slides positioned for engagement with mechanism upon the other of the compound slides for actuating a visual range indicator.

A feature of the invention resides in the double angle cam in operative association with an actuating bell crank lever of such ratio as to enable direct readings of the relative movements between the slides in only one thousandth of an inch in either direction from center over a distance of movement of as much as two inches with a one inch range indicator.

Another feature of the invention resides in the construction and mounting of the operating lever for protection thereof from dust and grit resulting from the grinding operations.

One of the advantages of the Visual indicator control in respect to the centering of the compound slides and the distance of movement or positioning of the tool relative to the line intersecting the axis of rotation of said slides, results from the minimum wear of the locating device or indicator operating mechanism, such as to effect the precision of the instrument, and also eliminating the feel of the operator otherwise .required in locating the tool through the Since, in the use of precision locating and setting of the tool is governed by the precise accuracy of the range indicator.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims:

Fig. 1 is a perspective view showing the former mounting and diamond wheel dresser with dust cap removed.

Fig. 2 is a central vertical section through the visual indicator control mechanism with the dust cap in place.

Fig. 3 is an illustrative diagram showing a portion of a grinding wheel being dressed with angles tangent to the radius of curvature.

Fig. 4 is a view similar to Fig. 3 illustrative of a tool being formed by a cupped grinding Wheel.

In the drawings there is illustrated a wheel or tool former adapted to be secured in the usual manner to a grinder table in adjustable relation to the usual motor driven grinding wheel H) to be dressed, as illustrated in Figs. 1 and 3, or the grinding wheel H for forming a tool thereby as illustrated in Fig. 4. The former includes the base I2 adapted to be securely clamped to the grinder table by any suitable means, said base being provided with a V-groove l3 in its bottom surface for receiving a dowel pin It for adjusting its angular relation to the horizontal. Said base i2 is provided with a turntable or swivel support l5, both the base and the swivel support carrying an annular Vernier scale, as indicated at [6. Mounted upon the swivel support l5 there is a lower or elongated slide l'l supported upon said swivel support B5 to slide diametrically thereon. Carried on the slide I! there is an upper or transverse slide l8 which is slidable transversely of the elongated slide. Thus, the slides l1 and I3 provide a compound slide support, the latter carrying a vertically and upwardly extending hollow post l9.

Slidably and adjustably mounted on the post there is a tool holder 20 suitable for supporting and clamping either a tool bit 2! (Fig. 4) engageable to be formed by the cupped grinding wheel II, or a diamond tool 22, 22a for dressing the grinding whel It, as shown in Figs. 1 and 3. Said tool holder is secured to the post l9 at the proper height by a set screw 23.

The upper transverse slide I8 is provided with a rack bar 26 extending transversely along the rear end thereof engageable and operable by a pinion 25 rotatably supported upon the elongated slide ll and rotatable by operating handle 28. Through manipulation of the handle 26 the rack and pinion will cause the slide !8 to move transversely of the slide ll. At determined positions of movement the slide l8 may be set and locked in position by a clamping lever 21 mounted there on and arranged to engage and clamp the slides l1 and 18 to prevent relative movement between said slides.

The elongatedtslide; I is similarly adjustable axially or the swivel support l-throngh the usual screw shaft operable through a rotatable wheel 28 which carries a Vernier scale 23. Adjustable stop devices, one of which is indicated-rat'fiikgare carried by an annular disk 3| secured to the base l2 adjustable about the periphery thereof to limit the swivel movement of the swivel support l5 relative thereto.

Secured to the upper face of the elongated slide,

I1 adjacent the transverse slide [8 there is a cam supporting block 32 to which the cam plate 33 is rigidly secured. Said cam plate is formed with a pair of'opposed camming surfaces 3'4, 35 tapering-inwardly-to meet in a v-formation in a precise line extending longitudinally of 'the'elongated slide 'll intersecting its'center ofrotation. Said'camming surfaces face the post I9 and are positioned to beengaged bythe arm 36 o'ia bell crank lever, said arm having a spherical bearing formation 31' on the end thereof. A supporting bracket 38 for said lever is secured upon the upper face of the transverse slide adjacent the cam plate-to pivotallysupport said bell-crank lever at 39. Theother arm 48 of said lever, whichas shown herein is twice the length of th arm 36,

extends through a slot 4*! in the post I9, terminating in a sphericalbearing 'd-z for supporting the lower'end' of an extension rod 43.

The extension'rod 43 is slidable longitudinally of the hollow post l9, extendingupwardly' therein to, engage a spindle 4 4 operablyconnected in the usual inanner with an indicatorpointertfi. Said spindleis slidable in a barrel 46 extending downwardlyinto:therhollow post and'secured therein bya; set, screw 41' and carries a casing 48 off the usualdial indicator 49'. The dial indicator is of a'standard; type well knownin the art, being so I designed as to .indicate movementsof its spindle 4pm the nature of, one'thousandths of'an inch and" provide readings throughout a one inch displacement of the spindle. Surroundingthe lower "end'ofthe post l'9and'mountedover the bell crank 'lever35, 40, to rest upon the cam plate 33,there is provided a dust guard cap 50 which may be slidable up the post to give access'to said plate and bell crank lever.

In operation, through thehandle 26, the transverse slide maybe reciprocated'back and forth across the elongated slide topositionor set said transverse slide with'the center of the post I9 on a line intersecting the center of rotation of the elongated-slide. In this position the bearing other camming surfaces .34, 35, correspondingly raising the dial spindle 44. Any ratio of movement desired may be employed, as shown herein "the ratio being two to one,'wherein the arm 40 of the bell crank lever is twice, thejl'ength of the arm36. 'Thus,for every increment of transverse movement of the slide l8, there will be half a corresponding movement of the dial spindle. Wherein the dial spindle may be such as to have an inch movement, it will, therefore, in fact indicate two inches of movement in either direction of the slide IS.

The angular relation of the camming surfaces =34-and35zis such as to'transmit the proper dial recording movement of the spindle 44 in accordance with the distance of transverse movement of the slide I3 relative to the slide l'l.

By means of the above mechanism, the transverse slide l8 carrying a tool may be accurately centered, indicated by the dial showing zero, or maybe moved in either direction or set at any transverse position relative to its center of rota- The tool may thereby be accurately positioned. for dressing a curvature, or located at any position'tangential to said curvature for dressing an angle tangent thereto. This is indicated in Fig. 3'wherein the tool is rotated about the axis A while the dial reads zero and may then be moved at an angle tangent thereto as indicated by the tool shown by dotted lines, to a prescribed distance as indicated by the dial. In dressing otherforms of wheels, the position of the tool 22 may be set at varying prescribed distances ofi center according to the reading of'the dial.

As illustrated. in Fig. 4, a tool 2| may be formed by the wheel I l, the relative position thereof, being off center from the center of the post 19 a prescribed distance, as indicated by the dial, andthe rotative positions about the center of curvature B being illustrated by dotted lines.

The invention claimed is:

1'. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first slide, an upright post carried by one of said slides, means for supporting a tool on said post, a visual indicator mounted on said post, and an actuator therefor on the other slide for indicating the relative positions of said tool carrying post and last mentioned slide.

2. A radius former comprising a base having a slides, a cam on the other slide, and actuating means operatively associated with said cam and indicator for indicating the relative positions of said slides.

3. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first plate, an upright post carried by one of said,slides, means for supporting a tool on said post, a'visual indicator on one of said slides, a cam on the other slide, and a bell crank lever having one arm operative to actuate said indicator and the other arm in sliding engagement with said cam for displacement thereby to indicate on said indicator the relative positions of said slides.

4. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of saidsupport, a second slide mounted for transverse adjustment relative to said firstslide, an uprightpost carried by one of said slides, means for supporting a tool on said post, a visual indicator on one of said slides, a cam on the other slide having opposed inclined camming surfaces merging one into the other on a line intersecting the axis of rotation of said swivel support, and actuating means operably associated with said cam and indicator movable relative to said cam over said cam surfaces for positioning said indicator in accordance with the relative positions of said slides.

5. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first slide, an upright post carried by one of said slides, means for supporting a tool on said post, a visual indicator on one of said slides, a cam on the other slide having opposed inclined camming surfaces merging one into the other on a line intersecting the axis of rotation of said swivel support, and a bell crank lever having one arm thereof operably associated with said indicator and the other arm extending into engagement with said cam for displacement by said cam surfaces in accordance with the relative positions of said slides.

6. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first slide, a hollow upright post carried by said second slide, means for supporting a tool on said post, a visual indicator on said post, a cam on said first slide, and actuating means mounted on said second slide operably connected with said indicator through said post and displaceable by said cam in accordance with the relative positions of said slides.

7. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first slide, a hollow upright post carried by said second slide, means for supporting a tool on said post, a visual indicator on said post, a cam mounted on said first slide, and a bell crank lever pivotally supported on said second slide, one arm of said bell crank lever being operably connected with said indicator through said post and the other arm thereof being in slidable engagement with said cam for displacement thereby in accordance with the relative positions of said slides.

8. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first slide, a hollow upright post carried by said second slide, means for supporting a tool on said post, a visual indicator on said post, a cam mounted on said first slide, a bell crank lever pivotally supported on said second slide, one arm of said bell crank lever being operably connected with said indicator through said post and the other arm thereof being in slidable engagement with said cam for displacement thereby in accordance with the relative positions of said slides, and a protective cap carried by said post slidable into and out of position for enclosing said lever.

9. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first slide, a hollow upright post carried by said second slide, means for supporting a tool on said post, a visual indicator on said post, a cam on said first slide having opposed camming surfaces extending outwardly at an angle to each other merging centrally in a line intersecting the center of rotation of said swivel support, and a bell crank lever pivotally mounted on said second slide having one arm operably connected with said indicator through said post and the other arm having slidable engagement with said cam surfaces, whereby said cam surfaces will effect displacement of said bell crank lever in accordance with the relative positions of said slides.

10. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first slide, means for supporting a tool on one of said slides, a visual indicator on said tool carrying slide, a cam on the other slide having opposed inclined camming surfaces merging one into the other on a line intersecting the axis of rotation of said swivel support, and actuating means operably associated with said cam and indicator movable relative to said cam over said cam surfaces for positioning said indicator in accordance with the relative positions of said slides.

11. A radius former comprising a base having a swivel support thereon, a first slide mounted for adjustment diametrically of said support, a second slide mounted for transverse adjustment relative to said first slide, means for supporting a tool on one of said slides, a visual indicator on said tool carrying slide, a cam on the other slide, and actuating means operably associated with said cam and indicator for indicating the relative positions of said slides.

INGOLF SNEVA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,476,573 Allen Dec. 4, 1923 1,527,379 Riordan et al Feb. 22, 1925 1,832,953 Watling et al Nov. 24, 1931 1,961,242 Osplack June 5, 1934 2,131,973 Rusnack et a1 Oct. 10, 1938 2,179,211 Flygare Nov. 7, 1939 2,360,754 Becket Oct. 17, 1944 FOREIGN PATENTS Number Country Date 442,156 Great Britain Feb. 3, 1936 

